Rotary drilling machine of well-boring apparatus



y J. CHILDS ROTARY DRILLING MACHINE OF WELL BORING APPARATUS 4 Sheets-Sheet 1 Filed July 15, 1924 4 Sheets-Sheet 2 7 lbm 614121.,

J. CHILDS ROTARY DRILLING MACHINE OF WELL BORING APPARATUS Filed July 15, 1924 May 10, 1927.

QM'W M m y 10, J. cHILDS ROTARY DRILLING MACHINE OF WELL BORING APPARATUS 4 Sheets-Sheet 3 Filed July 15, 1924 cf lumw 6% 2 65W .--1,6Z8,032 May 10, 1927' J. CHILDS ROTARY DRILLING MACHINE OF WELL BORING APPARATUS Filed J y 15, 1924 4 Sheets-Sheet 4 Patented Ma 1c, 1927. k 1,628,032 UNITED STATES PATENT OFFICE.

JAMES CHILDS, OF BARROW-IN-FURNE SS, ENGLAND, ASSIGNOR TO VICKERS LIM- ITED, OF WESTMINSTER, ENGLAND, A. BRITISH COMPANY.

ROTARY DRILLING MACHINE OF WELL-BORING APPARATUS.

Application filed'July 15, 1924, Serial No. 726,110, and in Great Britain September 1, 1923.

This invention relates to the rotary drill- Figure is a local section taken on the ing machines of well boring apparatus. line 5, 5 of Figure 4, and

Such machines as heretofore constructed Figures (5 and 7 are views similar to Fighave usually had keyed to the driving pinures, 1 and 5 (Figure 7 being a section on 5 ion shaft :1 locking collar with which pawls the line 7, 7 of Figure (3) showing the inco pivoted on the bedplate are adapted to en- I vention employed in conjunction with a gage so as to prevent the turntable driven somewhat different form of rotary drilling by the said shaft from rotating while tool machine.

joints or couplings are being tightened up A is the turntable having bevel teeth a n or slackened off by hand. It sometimeshapwith which a bevel pinion Z) on a driving pens that an attempt is made to start the shaft B engages. C is the locking collar machine with-the said pawls left in engagewith which pawls c, c pivoted on the bedment with the locking collar, with the replate D are adapted to engage. The locking sult that the driving chain or other parts collar has heretofore been keyed to the'driv- 1.3 of the driving mechanism are liable to being shaft B but in the present invention it come broken with possible injury to men is 1007015 mounted on the said shaft and is on the derrick floor; the chief object of the formed with a part C constituting one elepresent invention is to obviate this disadment of acone clutch the other element of v tag ,whieh is cont-:tituted by a member B keyed According to the invention the aforesaid to the driving shaf-t B. The unit constilocking collar instead of being keyed to the tuted by the locking collar C and the clutch driving pinion shaft as heretofore is conclement C is adjusted relatively to the nected thereto through a device which, in clutch element B by means of a nut c on the event of the machine being started with the shaft B between which nut and the colthe aforesaid pawls in engagement With the lar C a spring washer e is in erposed. The

locking collar, will slip and thereby permit nut 0' is locked in position by a locking nut the turntable to be revolved without damc on the shaft B. In the construction shewn age to any part of the driving mechanism. by Figures 1 to 3 the clutch element B is The said device is preferably constituted by made as a sprocket wheel for driving the 0 a cone or other friction clutch one element 'shaft B by means of a chain, whilst in the of which forms part of the locking collar construction shewn by Figures 4 and 5 the loosely mounted on the pinion shaft, and cluich element B (which is here the male the other element is keyed to the pinion element) is made'separate from the sprocket shaft; in the case of a chain driven machine wheel B and the elements Bv and C tothe latter clutch element may be made ingether with the parts associated therewith 9 tegral with or separate from the driven are arranged at the end of -t he driving shaft sprocket wheel, and in the'casc of a shaft B. In other respects these two constructions driven machine this clutch element may also are substantially the same. In Figures 6 be separate from the sprocket wheel which and 7 the elements B and C and the parts 40 in this form of machine is external to the associated therewith are arranged as in Fig parts carried by the bedplafe. ures 1 to 3 but the sprocket wheel B is con- In order that the said invention may be nected to a shaft 6 which is external to the clearly understood and readily carried into parts carried by the bedplate D and is conefiect the same will now be described more nected to the driving shaft B by the bevel fully with reference to the accompanying gearing shewn in Figure 6. In any of the 1 0 drawings, in which said consructions the cone clutch consti- Figures 1, Qand 3 are respectively a plan, tuted by the elements B, C may be replaced a section on the line 2, 2 of-Figure 1 and a by any other suitable type of friction clutch. section on the line 3, 3 of Figure 1 shewing It will be understood that in all the con- 60 a rotary drilling machine provided with one struction's shown the pawls 0, 0 are normally 1 constructional form of the invention, kept out of engagen'ient with the locking Fi ure 4 is a view similar to Figure 1 collar C so that when the turntable A is shewlng in less detail a rotarydrilling madriven from the shaft B the locking collar chine provided with a slightly modified con- C is rotated through the friction clutch B, structional form of the invention, r C. When tool joints or couplings are to be ed to the shaft B will slip with respect to the clutch element C held by the pawls c, c and the turntable A will be rotated, thereby avoiding the liability of the driving chain or other parts of the driving mechanism becoming broken.

\Vhat I claim and desire to secure by Lettors Pa-ent of the United States is 1. In a rotary well drilling machine having a' turntable and a shaft for driving said turntable the combination with said shaft of a locking collar loosely mounted thereon, a pawl adapted to engage with said collar to prevent rotation thereof, and a device secured to said shaft for impositively connecting said collar to said shaft to yieldably lock said shaft against rotation when said pawl is in engagement with said collar, whereby if said machine is started while said shaft is yieldably locked, said device will slip and permit said shaft to rotate said turntable.

2. In a rotary well drilling machine having a turntable and a shaft for driving said turntable the combination with said shaft of a locking collar loosely mounted thereon, a pawl adapted to engage with said collar to prevent rotation thereof, and a friction clutch for impositively connecting said collar to said shaft to yieldably lock said shaft against rotation when said pawl is in engagement with said collar, whereby if said machine is started while said shaft is yieldably locked, said clutch will slip and permit said shaft to rotate said turntable.

3. In a rotary well drilling machine having a turntable and a shaft for driving said turntable the combination with said shaft of a locking collar loosely mounted thereon, a

pawl adapted to engage with said collar to permit rotation thereof, and a friction clutch one element of which forms a part of said collar and the other of which is secured to said shaft for impositively connecting said collar to said shaft to yieldably lock said shaft against rotation when said pawl is in engagement with said collar, whereby if said machine is started While said shaft is yieldably locked, said clutch will slip and permit said shaft to rotate said turntable.

4. In a rotary well drilling machine having a bed-plate carrying a turntable and a shaft for driving said turntable the combination with said shaft of a locking collar loosely mounted thereon, a pawl pivoted to said bed-plate and adapted to engage with said collar to prevent rotation thereof, a friction clutch one element of which forms a part of said collar and the other of which is secured to said drive shaft to yieldably JAMES CHILDS. 

